Door latch-lock



f U IED STATES PATENT OFFICE.

JOHN o. KLINE, or PITTSBURGH, PENNSYLVANIA.

` DOOR LATCH-LOCK.

Specification of Letters Patent No.

To aZZ whom t may concern Be it known'v thatv I, JOHN C. KLINE, ofPittsburgh, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in Door Locks; and I do herebydeclare that the following is a full and exact description of theconstruction and operation of the same, reference being had to theannexed drawings, forming part of this specification, in which- Figure 1is a view of the lock (after removing the coverplate) whenunlocked; Fig.2 a view of the lock, when locked; Fig. 3 a section through the lineI-II of Fig. 1, and Iig. 4, a perspective view of the knob and shank.

In all these figures the same letters of reference indicate the sameparts.

A is the case; p, its cover plate.

a, a are two key holes, in reversed positions near each end of the lock;Z9', screwholes, to fasten the lock on the door.

B is the bolt.

c, c are notches for the night key to set in; Z Z, shoulders to stop thebolt by the key tumbler; e e, the back cross piece of the bolt, againstwhich the arms of the knob shank operate.

C is the key tumbler.

f f are notches for the bolt key to set in.

g g are projections or noses, to set against the shoulders cZ cZrespectively, when the key tumbler is turned by the key.

Z1, is a stationary pin, on which the key tumbler turns; a screw threadis cut in the pin, in which the screw enters, which fastens thecoverplate p to the case A of the lock.

D is the spring receiver (set in between the noses g g) with brokecorners forming oblique surfaces, against which the noses operate, whenthe key tumbler is turned.

E is the spring, set on a pin 7c fastened to the bolt. l

F isthe knob; G, the knob shank; Z Z, two arms cast in one piece withthe knob shank; the arms Z Z are instead of a knob tumbler, which isgenerally cast separate and fitted to the shank; in order to enable theshank to be introduced into the lock, the arms Z Z are in displacedpositions (as shown in Fig. t), and a slot m cnt out from the circularshank hole in the case, wide enough, to allow one of the arms Z or Z topass through.

After having described all parts of which the lock consists I proceed todescribe the 12,240, dated January 16, 1855.

operation of it as follows.: By turning the knob right or left, the boltis drawn back by the action of the arm Z or Z, in t-he common way, andthe spring E forces the bolt back again, when the knob is let loose. TheFig. 1 shows the bolt disengaged from the key tumbler, in which case thebolt can be freely worked by the knob, but by turning the bolt key n,the tumbler is brought into the position as represented in F ig.r 2, inwhich the nose g sets against the shoulder (Z of the bolt, and the part0 of the tumbler rests against the side of the bolt; and the springreceiver D (being-pushed back by the inclined, or oblique faces betweeng and D) rests against the nose g of the key tumbler. In this positionthe bolt is prevented from being moved by the knob. The Fig. 2 shows atthe same time, how the night key Q sets in the notch c, whereby the boltis stopped. The shape of the key tumbler is such, that a key inserted ineither of the key holes will operate it. The drawings show the lock,when used for left hand lock; the lock key is to be inserted in the keyhole a, and the key hole a is used to receive the nightkey, which latteris to be put in from the backside of the lock, before the sameisfastened to the door, its end butting against the wood work of the door,whereby itis secured in its place (see Fig. 3).

To use the lock as right hand lockk (in reversed position of that shownin the drawings), the night key would have to be put in the hole a, andthe hole a would be used for the bolt key.

The advantage in my improved lock consists in the simplicity of theconstruction, by having only one bolt to do the service of latch bolt,key bolt and night bolt, when at fthe same time, it can be used ri ht orleft, by using any of the key'holes for the night key, and the other forthe bolt key.

What I claim hereinas new and secure by Letters Patent is Thearrangement in double keyholed right and left hand locks of the keytumbler (c) with its noses or projections (g, g) in relation to thespring receiver D and the shoulders (eZ, CZ) of the bolt, as herein setforth.

JOHN C. KLINE.

desire to Witnesses:

HENRY MoPER, JNO. W. BARR.

